Electron-discharge device



H. W. WEINHART ELECTRON DISCHARGE DEVICE Filed Aug. 7, 1919 /n Ven for.' Ho ward W Wem/7d,

/fff A by Anw nee. is, 1923.

ramt@ HOWARD W. WEINHART, OF ELIZABETH, NEW JERSEY, ASSEGNOR T WESTERN ELEC- TRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK :lamanon-DISCHARGE Device.v

pplication lled August 7, 1919. Serial It'o.`3l5,33.

To all whom it may conce/m.'

Be it known that I, HOWARD W. WEIN- HART, a citizen of the United States, residing -atElizabeth, in the county of Union, State of (New Jersey, have invented certain new and useful Improvements in Electronyne ' vacuum tu Discharge Devices, of which the following is a full, clear, concise, and exact description.

The invention relates to electron discharge devices and to improvements in the electrode mounting for such tubes to adapt.

them for use with high voltages. lt has been found that when high voltages are employed for energizing an electron discharge device that a leakage current flows between the wires sealed into the vacuum tube and leading to the various electrodes.

An object of the present invention is to reduce this leakage current to a. minimum and also to dispense with the arbor commonly employed for supporting electrodes, whereby a more rugged construction is provided.

These objects are accomplished by prosviding a wide separation for the lead wires, whereby a comparatively high resistance is aiorded to a passage of leaka currents. To this end the stem or inw-ar ly projecting neck of the vacuum tube is terminated in a dome, so that the sealing-in points for the leading-in wires may be widely separated. To provide a wider separation of the supporting connections for the electrodes than is usual when the electrodes are supported from the single glass rod or arbor, this arbor is dispensed with, the electrodes being supported from a tubular member which arises from the stem and which forms an extension thereof. The supporting connections for the electrodes, or some of them, are spaced along this tubular portion at intervals great enough to prevent any substantial or serious 'low of leakage currents.

For further details of the invention, .ref-` erence may be made to the drawings in which the ligure illustrates in perspective a vacuum tube embodying the features of this invention.

4Referrin in detail to the drawing, the

ge 1 is provided with the stem or inwardly projecting neck 2 which terminates in a dome 3. Arising from the dome and concentric therewith and with the portion 4. For this axis of the tube,

ical grid 6 and helical cathode is arms 8, 9 and 10 extending therefrom and suitably fastened thereto, forl instance, by welding. The supporting'arms 8, 9 and 10 for the anode 5 are clamped to the exterior of the tu-bular portion 4: in a suitable Inanner, for instance, by a metallic band 11 held .1n place by a wrapping l2 of wire.

The grid is similarly provided with arms 13 and v14 which are clamped in place below band 11 by the metallic band 15 and a wrapping 16 of wire thereon. The lilamentary cathode is supported at one end by the wire or rod 17, extending within the tubular portion 4, and which forms an extension of the lead wire 18. rllhe otherend provided, 'with the supporting of this filament is supported by the arm 19 which'is sealed into from the stem 2.

rlhe leading-in wire 21 for the anode 5 is sealed into the dome at a point 22. The leading-in wires 23, 24 for the cathode are sealed into the dome at the points 25 and 26 respectively. The grid is provided with a leading-in wire 27 which is sealed 'into the dome at the oint 28. These points of sealing-in are wiely separated so that the leakage currents therebetween are reduced to a safe minimum. A wide separation is also provided for the supporting connections 11-12 and 15-16 for the anode and grid respectively.

What is claimed is:

1. vacuum tube comprising an inwardly projecting portion, a cathode, a grid surrounding said cathode, metallic supporting members extending from said grid, and means for clampin said members to the outer surface of said inwardly projecting portion.

2. A vacuum tube comprising an inward- 1y projecting tubular portion, a cylindrical grid, supporting members extending from said grid,` and a band for clamping said members to said tubular portion.

3. A vacuum tube comprising cathode, anode and control electrodes, supportin members-extending roma plurality of sai a glass rod 20 arising electrodes, and bands for clamping lsaid members to portions of said tube.

4:. An electron discharge device comprisin a vessel having a reentrant stem, a tubu ar member projecting from said stem into the interior of the vessel, a plurality of concentric electrodes spaced from the end of said tubular member, connections extending from the exterior of said tubular member to certain of said electrodes, and a lead Wire for another of said electrodes arranged substantially coaxial with said tubular member.

5. A vacuum tube comprising an inward- 1y projecting neck, a tubular portion arising therefrom, an electrode, means for clamping said electrode to said tubular portion, a lead to said electrode extending with in said tubular portion and a second lead to said 'electrode extending outside of said tubular portion.

6. A vacuum tube comprising a stem, a tubular extension coaxial with said stem, a plurality of electrodes arranged beyond the end of said tubular membennietallic members attached to the exterior lof said tucular member and supporting certain of said electrodes, lead wires for said electrodes attached to said metallic members, and a lead wire for another of said electrodes arranged coaxial of said tubular extension.

ln Witness whereof, ll hereunto subscribe my name this 25th day et July A. D., 1919. 

